Tesla Coil Transmitter for the 40m Amateur Band

How well do we understand the generation and propagation of electromagnetic waves? Current mainstream theory seems to cover things quite well but there are still anomalies worth exploring. Nikola Tesla’s work described another genre of wave propagation which can be best described as longitudinal waves rather than our familiar transverse waves. If indeed they do exist, and there is considerable evidence that they do, they are largely ignored or dismissed by popular physics.
This simple experiment with a Tesla coil was inspired by Eric Dollard (ericpdollard.com), Adrian Marsh PhD (www.am-innovat...), Griffin Brock (griffingbrock...., and others. I was trying to replicate their results using a Tesla coil coupled to ground, and whether the ground itself contributes to propagation through telluric currents. As with all scientific endeavours, experimentation may create more questions than answers, and solid conclusions are elusive. However, the results given in this video are encouraging enough for further investigation.

[@andrewandrosow4797]

I had done several experiments. I used a coil with 2meter wire , connected to 50Ohm transmitter with 1W power.I installed this wire with a coil on a balcony outside. I am living on the 4 floor in a flat in a big city. I tested it on 7.2MHz, 2.457MHz, 27MHz. The distance was not more that 1Km. I tested it with online SDR receivers, but I had not had any success.As a ground plane I used a metal visor outside and a big piece of foil. I isolated a transmitter with ferrite toroid with supply cable (like a EMI filter in SMPS).But in my flat I measured RF voltage in power sockets (AC 220V) . There was 0.5V... So, all the metallic construction in a building are receiving RF signal.

[@DavidSkelhon]

Thanks for the comment. If you are in a city, surrounded by high levels of RFI, I am not surprised that you couldn’t hear the signal above the noise 1 km away. In my latest video, I am operating outside the city, away from conducting structures that potentially absorb the signal. One Watt is a very small amount of power when using an inefficient antenna but even so, under the right propagation conditions, a distant receiver in a quiet location may detect it. Unfortunately, in your high noise location it would be difficult to hear a response unless the other station was using an efficient setup and more power.

[@till7253]

interesting video

[@DavidSkelhon]

Thanks!

[@SuperheroArmorychannel]

Amazing results for such a low watt low tech solution. Couldn’t the same concept be used with a large tesla coil?

[@DavidSkelhon]

I’m sure it could. The question is, how efficient is it compared, say, to a conventional dipole antenna? I suspect it will fall short but under some circumstances I could live with reduced efficiency if it is easier to deploy compared with 20m of wire strung between masts and trees. I will test it in the field and report back in the next video.

[@DavidSkelhon]

Absolutely, though I suspect this coil could handle several hundred Watts anyway.

[@MasterIvo]

Still EM waves, but Tesla was very clear he used changing electrostatic potentials.
I wonder if it is the same with the LMD resonant mode. I really advice everyone to read the 1891 lecture of Tesla (again) where he decribes the powerfull electrostatic effects which he later called Radiant energy. it behaves differently then the EM resonant mode (TEM)😊

[@DavidSkelhon]

Mainly TEM waves for sure, but there maybe a small LMD component too. Confirming it might be a subject for a for a future video.

[@MasterIvo]

@@DavidSkelhon I agree, both TEM- AND LMD resonant modes can be present.

[@ozzymandius666]

Can't do much nowadays without falling foul of the authorities.